CA1277765C - Systeme de brouillage de signaux de television - Google Patents

Systeme de brouillage de signaux de television

Info

Publication number: CA1277765C
Authority: CA; Canada
Prior art keywords: television signal; filter; phase; amplitude; output
Prior art date: 1985-03-15
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.): Expired - Lifetime

Application number

CA000503953A

Other languages

English (en)

Inventor

Richard W. Citta

Dennis M. Mutzabaugh

Gary J. Sgrignoli

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Zenith Electronics LLC

Original Assignee

Zenith Electronics LLC

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

1985-03-15

Filing date

1986-03-12

Publication date

1990-12-11

1986-03-12 Application filed by Zenith Electronics LLC filed Critical Zenith Electronics LLC

1990-12-11 Application granted granted Critical

1990-12-11 Publication of CA1277765C publication Critical patent/CA1277765C/fr

2007-12-11 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Links

230000004044 response Effects 0.000 claims abstract description 68
230000008054 signal transmission Effects 0.000 claims abstract description 25
230000005540 biological transmission Effects 0.000 claims abstract description 17
230000001934 delay Effects 0.000 claims abstract description 3
230000008878 coupling Effects 0.000 claims description 30
238000010168 coupling process Methods 0.000 claims description 30
238000005859 coupling reaction Methods 0.000 claims description 30
230000006870 function Effects 0.000 claims description 26
238000001514 detection method Methods 0.000 claims description 16
230000010363 phase shift Effects 0.000 claims description 15
101000863856 Homo sapiens Shiftless antiviral inhibitor of ribosomal frameshifting protein Proteins 0.000 claims 1
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230000005236 sound signal Effects 0.000 description 3
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Classifications

- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
- H04N7/171—Systems operating in the amplitude domain of the television signal
- H04N7/1713—Systems operating in the amplitude domain of the television signal by modifying synchronisation signals

Landscapes

Engineering & Computer Science (AREA)
Multimedia (AREA)
Signal Processing (AREA)
Television Systems (AREA)

CA000503953A 1985-03-15 1986-03-12 Systeme de brouillage de signaux de television Expired - Lifetime CA1277765C (fr)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
US711,947		1985-03-15
US06/711,947 US4706283A (en)	1985-03-15	1985-03-15	Television signal scrambling system

Publications (1)

Publication Number	Publication Date
CA1277765C true CA1277765C (fr)	1990-12-11

Family

ID=24860154

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
CA000503953A Expired - Lifetime CA1277765C (fr)	1985-03-15	1986-03-12	Systeme de brouillage de signaux de television

Country Status (2)

Country	Link
US (1)	US4706283A (fr)
CA (1)	CA1277765C (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US4802213A (en) *	1987-02-26	1989-01-31	Zenith Electronics Corporation	Sound masking in phase reversal TV scrambling system
US4885776A (en) *	1988-02-24	1989-12-05	Zenith Electronics Corporation	Television signal encoder with reduced transient switching effects
US5912970A (en) *	1996-04-09	1999-06-15	Zenith Electronics Corporation	Television scrambling system
RU2144741C1 (ru) *	1997-11-25	2000-01-20	Академия управления МВД РФ	Устройство для приема телевизионных сигналов

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US3184537A (en) *	1960-10-04	1965-05-18	Paramount Pictures Corp	Subscription-television system employing suppression of synchronizing signals
US3478166A (en) *	1963-09-09	1969-11-11	Intern Telemeter Corp	Cryptographic subscription television system with grey sync and dual mode augmenting signals
US3527877A (en) *	1965-10-21	1970-09-08	Charger Electronic Systems Inc	Coded video systems with signal phase inversion
US3530232A (en) *	1966-06-17	1970-09-22	Intern Telemeter Corp	Subscription television system
US3852519A (en) *	1972-10-20	1974-12-03	Optical Systems Corp	Video and audio encoding/decoding system employing suppressed carrier modulation
US3982062A (en) *	1973-07-26	1976-09-21	Jerrold Electronics Corporation	Video encription system
US4081831A (en) *	1976-04-08	1978-03-28	Twin County Trans-Video, Inc.	High security subscription television system employing real time control of subscriber's program reception
US4072909A (en) *	1976-09-27	1978-02-07	Zenith Radio Corporation	Automatic phase and frequency control system
US4222068A (en) *	1978-11-02	1980-09-09	American Television And Communications Corporation	Subscription television apparatus and methods
US4467353A (en) *	1982-03-25	1984-08-21	Zenith Electronics Corporation	Television signal scrambling system and method

1985
- 1985-03-15 US US06/711,947 patent/US4706283A/en not_active Expired - Lifetime
1986
- 1986-03-12 CA CA000503953A patent/CA1277765C/fr not_active Expired - Lifetime

Also Published As

Publication number	Publication date
US4706283A (en)	1987-11-10

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Legal Events

Date	Code	Title	Description
2003-12-11	MKLA	Lapsed
2022-09-10	MKLA	Lapsed	Effective date: 20031211